Camera module

Abstract

A camera module has a first lens group, a first lens block that holds the first lens group and has a first face, a second lens group, a second lens block that holds the second lens group and has a drive mechanism that drives the second lens group in the optical axis direction. The second lens block has a second face opposite the first face. A first hole is formed in one of the first face and the second face, and a first shaft that is fitted into the first hole is formed in the other of the first face and the second face.

What is claimed is: 
     
         1 . A camera module, comprising:
 a first lens group that transmits light;   a first lens block that holds the first lens group and has a first face;   a second lens group that transmits the light; and   a second lens block that holds the second lens group, has a drive mechanism to drive the second lens group in an optical axis direction, and has a second face opposite the first face, wherein   a first hole having a first inner peripheral surface having a circumferential shape is formed in one of the first face and the second face,   the first inner peripheral surface has a central axis that coincides with an optical center of the first lens group when the first hole is formed in the first face, and has a central axis that coincides with an optical center of the second lens group when the first hole is formed in the second face,   a first shaft having a first outer peripheral surface having a circumferential shape and being fitted into the first hole is formed in another of the first face and the second face, and   the first outer peripheral surface has a central axis that coincides with the optical center of the second lens group when the first shaft is formed in the second face, and has a central axis that coincides with the optical center of the first lens group when the first shaft is formed in the first face.   
     
     
         2 . The camera module according to  claim 1 , wherein
 the first face includes a first plane that is part of the first face, and   the second face includes a second plane that is part of the second face and is in surface contact with the first plane.   
     
     
         3 . The camera module according to  claim 1 , wherein
 a first recess is formed in one of the first face and the second face away from the optical center of the first lens group and the optical center of the second lens group, and   a first protrusion inserted into the first recess is formed on another of the first face and the second face.   
     
     
         4 . The camera module according to  claim 1 , wherein
 a first shaft hole is formed in the first lens block,   a second shaft hole is formed in the second lens block, and the camera module further comprises a shaft disposed across the first shaft hole and the second shaft hole.   
     
     
         5 . The camera module according to  claim 1 , wherein
 the second lens block has a first facing face,   the camera module further comprises
 an imaging element capturing an image formed by the light and 
 an imaging block holding the imaging element and having a second facing face opposite the first facing face, 
   a second hole having a second inner peripheral surface having a circumferential shape is formed in one of the first facing face and the second facing face, and   a second shaft having a second outer peripheral surface having a circumferential shape and being fitted into the second hole is formed in another of the first facing face and the second facing face.   
     
     
         6 . The camera module according to  claim 5 , wherein
 the first facing face includes a third plane that is part of the first facing face, and   the second facing face includes a fourth plane that is part of the second facing face and is in surface contact with the third plane.   
     
     
         7 . The camera module according to  claim 5 , wherein
 a second recess is formed in one of the first facing face and the second facing face away from the optical center of the first lens group and the optical center of the second lens group, and   a second protrusion inserted into the second recess is formed on another of the first facing face and the second facing face.   
     
     
         8 . The camera module according to  claim 5 , wherein
 a first shaft hole is formed in the first lens block,   a second shaft hole is formed in the second lens block,   a third shaft hole is formed in the imaging block, and   the camera module further comprises a shaft disposed across the first shaft hole, the second shaft hole, and the third shaft hole.   
     
     
         9 . The camera module according to  claim 5 , further comprising:
 a reflection element that reflects the light; and   a reflection block holding the reflection element and having a third facing face, wherein   the first lens block has a fourth facing face opposite the third facing face, and   a third hole having a third inner peripheral surface having a circumferential shape is formed in one of the third facing face and the fourth facing face, and   a third shaft having a third outer peripheral surface having a circumferential shape and being fitted into the third hole is formed in another of the third facing face and the fourth facing face.   
     
     
         10 . The camera module according to  claim 9 , wherein
 the third facing face includes a fifth plane that is part of the third facing face, and   the fourth facing face includes a sixth plane that is part of the fourth facing face and is in surface contact with the fifth plane.   
     
     
         11 . The camera module according to  claim 9 , wherein
 a third recess is formed in one of the third facing face and the fourth facing face away from the optical center of the first lens group and the optical center of the second lens group, and   a third protrusion inserted into the third recess is formed in another of the third facing face and the fourth facing face.   
     
     
         12 . The camera module according to  claim 9 , wherein
 a first shaft hole is formed in the first lens block,   a second shaft hole is formed in the second lens block,   a third shaft hole is formed in the imaging block,   a fourth shaft hole is formed in the reflection block, and   the camera module further comprises a shaft disposed across the first shaft hole, the second shaft hole, the third shaft hole, and the fourth shaft hole.